content: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2011, by Object Refinery Limited and Contributors.
   *
   * Project Info:  http://www.jfree.org/jfreechart/index.html
   *
   * This library is free software; you can redistribute it and/or modify it
   * under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation; either version 2.1 of the License, or
   * (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
   * License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
   * USA.
   *
   * [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
   * Other names may be trademarks of their respective owners.]
   *
   * ---------------------------
   * CategoryDatasetHandler.java
   * ---------------------------
   * (C) Copyright 2003-2008, by Object Refinery Limited and Contributors.
   *
   * Original Author:  David Gilbert (for Object Refinery Limited);
   * Contributor(s):   -;
   *
   * Changes
   * -------
   * 23-Jan-2003 : Version 1 (DG);
   *
   */
  
  package org.jfree.data.xml;
  
  import org.jfree.data.category.CategoryDataset;
  import org.jfree.data.category.DefaultCategoryDataset;
  import org.xml.sax.Attributes;
  import org.xml.sax.SAXException;
  import org.xml.sax.helpers.DefaultHandler;
  
  /**
   * A SAX handler for reading a {@link CategoryDataset} from an XML file.
   */
  public class CategoryDatasetHandler extends RootHandler implements DatasetTags {
  
      /** The dataset under construction. */
      private DefaultCategoryDataset dataset;
  
      /**
       * Creates a new handler.
       */
      public CategoryDatasetHandler() {
          this.dataset = null;
      }
  
      /**
       * Returns the dataset.
       *
       * @return The dataset.
       */
      public CategoryDataset getDataset() {
          return this.dataset;
      }
  
      /**
       * Adds an item to the dataset.
       *
       * @param rowKey  the row key.
       * @param columnKey  the column key.
       * @param value  the value.
       */
      public void addItem(Comparable rowKey, Comparable columnKey, Number value) {
          this.dataset.addValue(value, rowKey, columnKey);
      }
  
      /**
       * The start of an element.
       *
       * @param namespaceURI  the namespace.
       * @param localName  the element name.
       * @param qName  the element name.
       * @param atts  the element attributes.
       *
       * @throws SAXException for errors.
       */
      @Override
      public void startElement(String namespaceURI,
                               String localName,
                               String qName,
                               Attributes atts) throws SAXException {
  
          DefaultHandler current = getCurrentHandler();
          if (current != this) {
              current.startElement(namespaceURI, localName, qName, atts);
          }
          else if (qName.equals(CATEGORYDATASET_TAG)) {
              this.dataset = new DefaultCategoryDataset();
          }
          else if (qName.equals(SERIES_TAG)) {
              CategorySeriesHandler subhandler = new CategorySeriesHandler(this);
              getSubHandlers().push(subhandler);
              subhandler.startElement(namespaceURI, localName, qName, atts);
          }
          else {
              throw new SAXException("Element not recognised: " + qName);
          }
  
      }
  
      /**
       * The end of an element.
       *
       * @param namespaceURI  the namespace.
       * @param localName  the element name.
       * @param qName  the element name.
       *
       * @throws SAXException for errors.
       */
      @Override
      public void endElement(String namespaceURI,
                             String localName,
                             String qName) throws SAXException {
  
          DefaultHandler current = getCurrentHandler();
          if (current != this) {
              current.endElement(namespaceURI, localName, qName);
          }
  
      }
  
  }
  